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(diesel) Fuel sender faulty?

mikeau

mikeau

Moderator
Staff member
Site Donor
Hi,

I just bought a 100tdi (my first Landie).
My fuel filter seems to show correctly while its more than 3/4 full, but below that, it just goes straight to 'Empty' (it flickers a bit betwen the two at the 'change over' point).

I'm 99% sure its the sender unit...

How difficult is it to get the sender unit out of the tank?
Has anyone got any tips or tricks for this job?

Thanks

MikeA
 
The senders are windings around an insulated spine, the float has an arm with a little pointer that contacts the windings. The lower down or higher up the winding, the greater or less the resistance, so the gauge needle alters.

After a while, the hardened tip on the little arm wears the wires down, so it doesn't conact the winding. It will be complete or the gauge wouldn't work.

You need to take the sender out the top of the tank. 6 screws, I think, but Snagger, Sandy or CCK will probably know, I haven't had one out for years.

Chris
 
Problem is, you need to drop the fuel tank from underneath the vehicle to get at the sender unit (and, yest, it is 6 screws that hold it in place to the top of the tank).

The sender unit to side tanks (if you've got one, below the front seat) can be got at from inside the vehicle so no need (usually) to drop them.

A bien tôt.
 
Jode said:
Problem is, you need to drop the fuel tank from underneath the vehicle to get at the sender unit (and, yest, it is 6 screws that hold it in place to the top of the tank).
Click to expand...

I've already had it out, and without dropping the tank...

The sensor unit is on the LHS of the tank and visible just behind the rear wheel and above the chassis section.

Its a bit tight for space in there, but I jacked up (and supported) the LH rear and was able to remove the sensor unit with not too may difficulties.

No screws, but a kind of locking collar which twists to release. A bit fiddly in the confined space, but has to be easier to do it this way than draining the tank etc...

The windings were completely knackered, so I have another sensor on order (with a fitting kit - new seals?).

:)
 
FYI.
Heres the view from the side;
 

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Alice said:
I've got one like that :)
I don't suppose you know what the tanks fuel pick-up pipe is like by any chance?
If it has a gauze or net over it, is fixed internally & such stuff.
Click to expand...

I took a quick piccy with my camera so I can check the new one when I get it.
It looks like this;
 

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Thanks for the picture, it at least shows that there isn't a net of sorts covering the pick-up pipe which might be getting blocked.
 
Well, not on mine anyway...
I'm pretty sure that mine is original, so unless there were different types of sensor/pickup fitted (or yours has been replaced at some point since) then no, there isnt any filter...
 
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